MINOR: [Documentation] Added DARROW_FLIGHT_SQL to C++ optional components (#13777)
MINOR: [Documentation] Added DARROW_FLIGHT_SQL to C++ optional components (#13777)

Authored-by: patrick <8e832a89dc3df5ce21eb646801a37e6bad22ce6d@users.noreply.github.com>
Signed-off-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>
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